Question

Find the sum of 2+4+6+.......+20
0

Answer 1

Answer:

,110

Step-by-step explanation:

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Answer 2

Answer:

40200

Step-by-step explanation:

2 + 4 + 6 + ... + 200

2(1 + 2 + 4 + ... + 100)

Sum of 'n' numbers starting from 1

$= \frac{n(n + 1)}{2}$

Sum of 100 numbers starting from 1

$= \frac{200(200 + 1)}{2}$

$= \frac{200 \times 201}{2}$

$= \: 100 \times 201$

$= 20100$

2(1 + 2 + 3 + 4 + ... 100)

= 2 × 20100

= 40200